The upper-left coordinates on a rectangle are (-4,4)left parenthesis, minus, 4, comma, 4, right parenthesis, and the upper-right coordinates are (4,4)(4,4)left parenthesis, 4, comma, 4, right parenthesis. The rectangle has an area of 888 square units.

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geometry: triangles

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call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

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